trigger Update_Service_Request_Price on IT_Service_Request__c (before insert, before update) {
    for (IT_Service_Request__c sr : Trigger.new){
        // Update Price__c with calulated value in Calculated_Price__c
        // Price__c is used by a roll up summery field in IT Request to calulate total amount of services
        //
        sr.Price__c = sr.Calculated_Price__c;
    }

}